Improvement in burglar-alarms



c. EQPIERCE.

BURGLAR-ALARM.

PaientdMaYlS, 1876.

Wzizwsses.

r o m M l N-PEltRs, PKOTO-LITHDGRAPHER, wAsumGYOk. D. cv

UNITED S ATES PATENT QFFICE.

CHARLES EQPIEROE, on NEW YORK, N. Y.

' ,IMPROVEMENTIN BURGLAR-ALARMS.

Specification forming part of Letters Patent No. 1 77,555,dated May 16, 1876; application l May 11, 1876.

To all whom it may concern.-

Be it known that I, G. E. PIERCE, of New York city,New York,have invented a new and useful Improvemen tin Portable and Stationary Burglar-Alarm and Fastener, which 1 design to be used in looking doors, windows, gates, &c., and giving an alarm at one and the same time, when my alarm-fastener is properly adjusted to a door, gate, shutter, or window, and pressure is made against the same. The following is a full, clear, and exact description thereof, reference being bad to the annexed drawings, making a part of "the same, in which Figurel represents a front view of my alarmfastener with bell removed. Fig. 2represen'ts a sectional view of my alarm-fastener, showing a bell fastened to central spindle c of the alarm movement, also a side view of a detentlever, called 9, with its inner, end coming in contact with one end of arm or wire 0, at-- tached to spindle e of the alarm, and the out- V er end of lever 9 coming in contact witha slot on plate h, which is fastened to door-jamb l. Fig. 3 represents a front view of av slotted plate, with screw-holes and teeth, and formsa part of my fastener and invention.

a, on Fig. 1, represents the base of the alarmfastener, and a the screw-holes, which are made oblong to allow the fastener, when desired, to be moved on a door, gate, or window, when properly adjusted to either.

a on Fig. 1, represents a bolt or tenon, with shoulder a projecting out from base a, for

' purposes hereinafter described." 1

b, on Figs. 1 and 2, represents front and side views of a-plate fastened to studs fastened to base a, to hold the different parts of the alarm movement together in their places.

The studs and some of the other parts of the alarm movementare not shown in the drawin g, as they are. old devices for clocks, &c.

b, on Fig. 1, represents the outer ends of the studs, andfholds on plate b, through which the ends of the studs (with holes in) pass, for pins to be fastened into, to hold plate I) in its place. 7

c, on Figs. 1. and 2, represents end and side views of a central spindle of the alarm movement, to which a bell and spring are fastened.

0 on Fig. 2, represents a sectional view of a bell'fastened to central spindle 0, and is used of slot If.

in place of, and as a substitute for, a key to wind spring 0, attached to central spindle c and one of the studs of the alarm movement.

d, on Figs. 1 and 2, represents front and side views of a verge-wheel, the cogs of which mesh into cogs of the main wheel on central spindle c.

e, on Figs. 1 and 2, represents end and side views of a spindle, to which is attached a verge, bell-hammer wire, and arm or wire, called 0. The outer end of arm 0 is bent, so as to come in contact with inner end g ofdetentlever g, to lock, the bell-hammer away from the bell when desired.

g, on Figs. 1 and 2, represents front and side views of a detent-lever pivoted to base a.- g is the inner endof lever g, and g the outer end. 9 comes in contact with arm 6, as above explained, and outer end 9 moves into slot h on plate h, when a door, 860., is locked with the alarm-fastener.

h, on Figs. 2 and 3, represents front and side views of a plate with slots and teeth, also screw-holes, and is used in connection with my alarm-fastener. h on one end of plate h, on Fig. 3, represents a slot for bolt end or tenon a on base a, to pass into plate h,.resting against shoulder a on base a. Bolt end a and plate h, on Fig. 2, are held in their places by pin i passing through a hole in bolt end a (See Fig. 1.)

k on plate h, Fig. 3, represents a small slot, into which moves outer end g of lever g, pivoted to base a. Whenever bolt end a? is moved into slot h of plate h the front side of outer end g closely fits against the front inner edge (See Fig. 2.)

The open space F, Fig. 2, between the front side of bolt end a and the edge of slot h (shown on Fig. 2,) is made in slot hi, to allow bolt end a on base a, attached to a door, gate, or window, to move slightly in slot h when pressure is made against the door, &c., and after such movement to securely lock the same.

When the-alarm-fastener is properly adjustfront inner edge of slot h and the zfront side of bolt end a,.allo ,ws the d0Ql,.;&c. ,toslightly move. Such motion instantly brings outer end g of lever g in contact with the edge of slot h of plate h, and moves inner end' 9 of V lever g, pivoted to plate ,a, away t 'rom armor wire 0, and frees the-bell-hanimer *to strike: the bell fastened to spindle 0. (See Fig. 2;) Bolt end a immediately-eomingin eontaet; with the front inner edge of slot h, securely locks the door, gate, or window. Bin 11. holds the alarin in its place on platejg, vghfil! used as a portable alarm fastener, and not screwed to a door, gate, or window.

Having thus described my new alarm-fast; ener, and the manner in which the same is operated, what -I claim-asnewtherein an'dda she ;to secure by Letters iBa-tent is" E CHARLES E PIERCE.

Witnesses 

